Titanium Alloy U Bent Tube
Titanium Alloy U Bent Tube - seamless steel tube
Grade7 Ti-Pd alloy seamless & welded tubing with enhanced reducing acid & seawater corrosion resistance, full ASTM B338 compliance for industrial heat exchangers.
Palladium Doped Titanium Tubing With Superior Crevice & Pitting Corrosion Resistance For Heat Exchangers
Grade 7 titanium tube is a palladium-bearing alpha titanium alloy with UNS designation R52400, specified under ASTM B338 standard for condensers and heat exchanger tubing. It adds 0.12%~0.25% palladium to standard Grade2 pure titanium matrix, certified ISO 9000 manufacturing system. The trace palladium element optimizes electrochemical performance, greatly improving resistance to localized crevice and pitting corrosion which easily damages regular CP titanium in stagnant chloride & reducing acid environments.
Both seamless cold-drawn and continuous TIG welded Grade7 tubing are available, finished with standard pickled matte surface, fully pass PMI alloy composition inspection via portable spectral analyzer before delivery.
Estimated working pressure (psig) for ASTM B338 / ASME SB-338 Grade 7 titanium tubes based on OD and wall thickness. Values are for reference only; final design must follow ASME B31.3 / BPV Code calculations.
| Tube O.D. (in) |
Wall Thickness (in) & Working Pressure (psig) | |||||||
|---|---|---|---|---|---|---|---|---|
| 0.028 | 0.035 | 0.049 | 0.065 | 0.083 | 0.095 | 0.109 | 0.120 | |
| 1/8 | 7900 | 10100 | ||||||
| 1/4 | 3700 | 4800 | 7000 | 9500 | ||||
| 5/16 | 3700 | 5400 | 7300 | |||||
| 3/8 | 3100 | 4400 | 6100 | |||||
| 1/2 | 2300 | 3200 | 4400 | |||||
| 3/4 | 2200 | 3000 | 4000 | 4600 | ||||
| 1 | 2200 | 2900 | 3400 | 3900 | 4300 | |||
| Mechanical Index | Minimum Standard Value |
|---|---|
| Minimum Tensile Strength | 345 MPa (50 ksi) |
| 0.2% Offset Yield Strength Min | 275 MPa (40 ksi) |
| Elongation (2 inch gauge length) | 20% |
Excellent ductility supports tube sheet expansion, U-bending and all standard GTAW welding operations without cracking defects.
| Element | Content Limit |
|---|---|
| Titanium (Ti) | Balance |
| Palladium (Pd) | 0.12 ~ 0.25 |
| Nitrogen (N) | ≤ 0.03 |
| Carbon (C) | ≤ 0.08 |
| Hydrogen (H) | ≤ 0.013 |
| Iron (Fe) | ≤ 0.25 |
| Oxygen (O) | ≤ 0.15 |
| Single Residual Impurity | ≤ 0.10 each |
| Total Residual Impurities | ≤ 0.40 total |
The following chart lists available wall thicknesses and corresponding outside diameters (OD) for ASTM B338 / ASME SB-338 Grade 7 titanium tubes. All dimensions are in inches.
| Wall Thickness (in) | Available Outside Diameters (OD) |
|---|---|
| 0.010 | 1/16″, 1/8″, 3/16″ |
| 0.012 | 1/8″ |
| 0.016 | 1/8″, 3/16″ |
| 0.020 | 1/16″, 1/8″, 3/16″, 1/4″, 5/16″, 3/8″ |
| 0.028 | 1/8″, 3/16″, 1/4″, 5/16″, 3/8″, 1/2″, 3/4″, 1″, 1 1/2″, 2″ |
| 0.035 | 1/8″, 3/16″, 1/4″, 5/16″, 3/8″, 7/16″, 1/2″, 9/16″, 5/8″, 3/4″, 7/8″, 1″, 1 1/4″, 1 1/2″, 1 5/8″, 2″, 2 1/4″ |
| 0.049 | 3/16″, 1/4″, 5/16″, 3/8″, 1/2″, 9/16″, 5/8″, 3/4″, 7/8″, 1″, 1 1/8″, 1 1/4″, 1 1/2″, 1 5/8″, 2″, 2 1/4″ |
| 0.065 | 1/4″, 5/16″, 3/8″, 1/2″, 9/16″, 5/8″, 3/4″, 7/8″, 1″, 1 1/4″, 1 1/2″, 1 5/8″, 1 3/4″, 2″, 2 1/2″, 3″ |
| 0.083 | 1/4″, 3/8″, 1/2″, 5/8″, 3/4″, 7/8″, 1″, 1 1/4″, 1 1/2″, 1 5/8″, 1 7/8″, 2″, 2 1/2″, 3″ |
| 0.095 | 1/2″, 5/8″, 1″, 1 1/4″, 1 1/2″, 2″ |
| 0.109 | 1/2″, 3/4″, 1″, 1 1/4″, 1 1/2″, 2″ |
| 0.120 | 1/2″, 5/8″, 3/4″, 7/8″, 1″, 1 1/4″, 1 1/2″, 2″, 2 1/4″, 2 1/2″, 3″ |
| 0.125 | 3/4″, 1″, 1 1/4″, 1 1/2″, 2″, 3″, 3 1/4″ |
| 0.134 | 1″ |
| 0.250 | 3″ |
| 0.375 | 3 1/2″ |
Note: Custom sizes and metric dimensions (mm) are available on request. All tubes can be supplied with pickled, annealed, or polished finishes per ASTM B338 requirements.
We manufacture and supply ASTM B338 Grade 7 titanium pipes and tubes to EPC contractors, fabricators and end-users across major industrial regions.
ASTM B338 Grade 7 titanium tubes combine the corrosion resistance of commercially pure titanium with the enhanced crevice and pitting resistance provided by palladium (0.12–0.25%). This makes them the preferred choice for aggressive chloride and acidic service environments.
Material Selection Note: Grade 7 is typically selected over Grade 2 when process fluids contain reducing acids or exhibit high chloride concentrations that exceed the pitting threshold of unalloyed titanium. For high-pressure or high-temperature designs, always verify compatibility with ASME B31.3 or Section VIII calculations.
Titanium is a transition metal valued for its high strength-to-weight ratio, excellent corrosion resistance and biocompatibility. It is widely used in aerospace, chemical processing, marine and medical applications.
Titanium uses chemical symbol Ti, atomic number 22 and atomic weight 47.90. It ranks as the 9th most abundant element and 4th most abundant metallic element within the Earth’s crust. The main natural mineral deposits containing titanium are rutile and ilmenite, which are mostly mined in Australia and South Africa.
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